drm/i915: preserve swizzle settings if necessary v4

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Some machines (like MBAs) might use a tiled framebuffer but not enable
display swizzling at boot time.  We want to preserve that configuration
if possible to prevent a boot time mode set.  On IVB+ it shouldn't
affect performance anyway since the memory controller does internal
swizzling anyway.

For most other configs we'll be able to enable swizzling at boot time,
since the initial framebuffer won't be tiled, thus we won't see any
corruption when we enable it.

v2: preserve swizzling if BIOS had it set (Daniel)
v3: preserve swizzling only if we inherited a tiled framebuffer (Daniel)
    check display swizzle setting in detect_bit_6_swizzle (Daniel)
    use gen6 as cutoff point (Daniel)
v4: fixup swizzle preserve again, had wrong init order (Daniel)

Reported-by: Kristian Høgsberg <hoegsberg@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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This commit is contained in:

Jesse Barnes 2014-10-09 12:57:43 -07:00 • committed by Daniel Vetter

parent 163f53a261

commit d9ceb81633

3 changed files with 32 additions and 15 deletions

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2

drivers/gpu/drm/i915/i915_drv.h

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41

drivers/gpu/drm/i915/i915_gem_tiling.c

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4

drivers/gpu/drm/i915/intel_display.c

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